Re: [PATCH v3 14/19] board: emulation: Add qemu-loongarch

On Sat, Aug 22, 2026 at 08:40:34PM +0000, Yao Zi wrote:
> On Fri, Aug 21, 2026 at 10:20:55AM -0600, Tom Rini wrote:
> > On Fri, Aug 21, 2026 at 08:42:14AM +0000, Yao Zi wrote:
> > 
> > > From: Jiaxun Yang <[email protected]>
> > > 
> > > Yet another generic QEMU VIRT machine.
> > > 
> > > LoongArch QEMU splits the main RAM into two parts: the first 512M is
> > > placed at 0x0, and the rest is placed at 0x8000000. FDT locates at
> > > 0x100000. BIOS is mapped to the first flash mapped to 0x1c000000, where
> > > U-Boot starts execution.
> > > 
> > > Signed-off-by: Jiaxun Yang <[email protected]>
> > > Signed-off-by: Yao Zi <[email protected]>
> > [snip]
> > > diff --git a/arch/loongarch/dts/qemu-loongarch64.dts b/arch/loongarch/dts/qemu-loongarch64.dts
> > > new file mode 100644
> > > index 000000000000..39d303798fcb
> > > --- /dev/null
> > > +++ b/arch/loongarch/dts/qemu-loongarch64.dts
> > > @@ -0,0 +1,9 @@
> > > +// SPDX-License-Identifier: GPL-2.0+
> > > +/*
> > > + * Copyright (C) 2024 Jiaxun Yang <[email protected]>
> > > + */
> > > +
> > > +/dts-v1/;
> > > +
> > > +/ {
> > > +};
> > 
> > I thought I had pushed everything so that we do not need to have fake
> > empty dts files anymore.
> 
> Do you mean OF_OMIT_DTB? Even with it enabled, a devicetree blob,
> specified by CONFIG_dEFAULT_DEVICE_TREE, is always built, but not
> integrated in the final u-boot.bin.
> 
> qemu_arm_defconfig also ships an empty devicetree. I'm not sure whether
> there's really a way to avoid building a dtb...

There is, but, OK, I didn't post a v2 of the series:
https://lore.kernel.org/u-boot/[email protected]/
So, this comment doesn't apply as it's not something you can avoid doing
yet.

-- 
Tom

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